Instant Whitelist Rejection


We’ve been completely unable to whitelist our domain for over a month. Our gallery card works perfectly through the validator, but when we request whitelisting we receive an email saying “The URL you provided for to use the gallery card did not validate. Please make sure the page contains valid metadata, then reapply for a Twitter card.”. I’ve checked this about a million times, the metadata is there. I’ve created a page on another domain containing the metadata tags, and that has exactly the same response. Can anyone see what we might be missing?